The genus Bidens ... Sherff, Earl Edward, 1886-1966 creator text book Chicago 1937 1937
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ENG LAT Paged continuously. The descriptions of specimens are largely in Latin. Bidens QK1 .F4 v. 16 583.5533 Publication (Field Museum of Natural History : 1909), 388,389 Publication (Field Museum of Natural History : 1909), Botanical series, v. 16, pt. 1-2 https://www.biodiversitylibrary.org/bibliography/42246 https://www.biodiversitylibrary.org/bibliography/2287 982996 10.5962/bhl.title.2287